1 6303eedc 2020-10-24 stsp /*	$OpenBSD: strlcpy.c,v 1.16 2019/01/25 00:19:25 millert Exp $	*/
 2 6303eedc 2020-10-24 stsp 
 3 6303eedc 2020-10-24 stsp /*
 4 6303eedc 2020-10-24 stsp  * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
 5 6303eedc 2020-10-24 stsp  *
 6 6303eedc 2020-10-24 stsp  * Permission to use, copy, modify, and distribute this software for any
 7 6303eedc 2020-10-24 stsp  * purpose with or without fee is hereby granted, provided that the above
 8 6303eedc 2020-10-24 stsp  * copyright notice and this permission notice appear in all copies.
 9 6303eedc 2020-10-24 stsp  *
10 6303eedc 2020-10-24 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 6303eedc 2020-10-24 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 6303eedc 2020-10-24 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 6303eedc 2020-10-24 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 6303eedc 2020-10-24 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 6303eedc 2020-10-24 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 6303eedc 2020-10-24 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 6303eedc 2020-10-24 stsp  */
18 6303eedc 2020-10-24 stsp 
19 6303eedc 2020-10-24 stsp #include <sys/types.h>
20 6303eedc 2020-10-24 stsp #include <string.h>
21 6303eedc 2020-10-24 stsp 
22 6303eedc 2020-10-24 stsp /*
23 6303eedc 2020-10-24 stsp  * Copy string src to buffer dst of size dsize.  At most dsize-1
24 6303eedc 2020-10-24 stsp  * chars will be copied.  Always NUL terminates (unless dsize == 0).
25 6303eedc 2020-10-24 stsp  * Returns strlen(src); if retval >= dsize, truncation occurred.
26 6303eedc 2020-10-24 stsp  */
27 6303eedc 2020-10-24 stsp size_t
28 6303eedc 2020-10-24 stsp strlcpy(char *dst, const char *src, size_t dsize)
29 6303eedc 2020-10-24 stsp {
30 6303eedc 2020-10-24 stsp 	const char *osrc = src;
31 6303eedc 2020-10-24 stsp 	size_t nleft = dsize;
32 6303eedc 2020-10-24 stsp 
33 6303eedc 2020-10-24 stsp 	/* Copy as many bytes as will fit. */
34 6303eedc 2020-10-24 stsp 	if (nleft != 0) {
35 6303eedc 2020-10-24 stsp 		while (--nleft != 0) {
36 6303eedc 2020-10-24 stsp 			if ((*dst++ = *src++) == '\0')
37 6303eedc 2020-10-24 stsp 				break;
38 6303eedc 2020-10-24 stsp 		}
39 6303eedc 2020-10-24 stsp 	}
40 6303eedc 2020-10-24 stsp 
41 6303eedc 2020-10-24 stsp 	/* Not enough room in dst, add NUL and traverse rest of src. */
42 6303eedc 2020-10-24 stsp 	if (nleft == 0) {
43 6303eedc 2020-10-24 stsp 		if (dsize != 0)
44 6303eedc 2020-10-24 stsp 			*dst = '\0';		/* NUL-terminate dst */
45 6303eedc 2020-10-24 stsp 		while (*src++)
46 6303eedc 2020-10-24 stsp 			;
47 6303eedc 2020-10-24 stsp 	}
48 6303eedc 2020-10-24 stsp 
49 6303eedc 2020-10-24 stsp 	return(src - osrc - 1);	/* count does not include NUL */
50 6303eedc 2020-10-24 stsp }